So, this is pretty much everything the HN crowd was asking for, right? Pull AMP apart into a bunch of web standards and switch Google search to promote any content which follows those standards rather than AMP content specifically? Why are all the top comments so negative?
Google could still be planning to keep the top banner, the left/right swipe to your competitor functionally for carousels, etc. That top banner, for example, has an [x] button that end users expect to dismiss the banner and stay on the page. Instead, it goes back to Google.
The negativity is because they aren’t being explicit as to what is actually being delivered. They are still retaining the right to run their own arbitrary JS on YOUR site, which could do almost anything they want.
TLDR: too soon to tell how genuine the message is, and Google isn’t working very hard to clear it up.